Concentric golf ball marker



FIG. 1 is a top perspective view of a concentric golf ball marker showing my new design;

FIG. 2 is a bottom perspective view thereof; and,

FIG. 3 is an exploded top perspective view thereof.

Any broken line illustration of environmental structure in the drawing is not part of the design sought to be patented. 

CLAIM The ornamental design for a concentric golf ball marker, as shown and described. 